#include<bits/stdc++.h>
using namespace std;

int main(){
	int n,i,b;
	char a[114514];
	cin>>n>>a;
	for (i=0;i<=strlen(a);i++){
		for (int l=0;l<n;l++){
			a[i]++;
			if (a[i]>'z') a[i]='a';
		} 
	}
	cout<<a;
}

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